Apart from fact that for most devices USB specs do not specify exact format of data send/received by device, many manufacturers actually ignore specifications o

Apart from fact that for most devices USB specs do not specify exact format of data send/received by device, many manufacturers actually ignore specifications of standard formats (eg. HID) and invent their own/implement standard formats in various weirdly broken ways (see Wiimote for example, or any reasonably modern USB "modem-like" device)